Surgeon&#39;s lamp



Aug. 17 1926. Y

A P. A. NIRDLNGER sURGEoNs LAMP Filed Nov. 50, 1921 5 Sheets-Sheet 1Aug. 17 1926. v 1,596,370

P. A. NIRDLINGER sURGEoN's LAMP Aug. 17 1926. 1 1 1,596,370

P. A. NIRDLINGER SURGEON S LAMP 5 sheets-sheet 4 1111EA Nov. 5o, V1921@55% gzal, @ffm/www Hy 17%@ 0 7 5 907 .t 6 e 9 m 5, q.. 1 e. M ./,V m mim M NA, ULO Dwz RN. f 10W NmN Awww R m a j wm 8 1 7 1 ...W D v g 4 Au mff fw Patented Aug. 17, 1926.

UNITED STATES 1,596,370 PATENT OFFICE.

PATRICK A. NIRDLINGER, F CHICAGO, ILLINOIS.

SURGEONS LAMP.

Application led November 30, 1921. Serial No. 518,816.

This invention relates to illuminating units especially applicable tooperatingA shall be of improved construction, eiiicientA in operationand convenient. to manipulate.

The invention is exemplified in the combination and arrangement of partsshown in the accompanying drawings and described in the followingspecification, and it is more specifically pointed out in the appendedclaims. l

Fig. 1 is an elevation of 4one embodiment of the present invention.'

Fig. 2 is a vertical section of the support for the mechanism shown inFig. 1.

Fig. 3 is a top plan view of the mechanism shown in Fig. 1, Without theexterior light. A

Fig. 4 is Aa top plan view of the illuminating unit on a larger scalethan that of Fig. 3.

Fig. 5 is an elevation of the illuminating unit shown in Fig. 4.

Fig. 6 is a vertical sectional view of the illuminating unit.

Fig. 7 is a sectional view of one of the beam projectors comprised intheunit.

Fig. 8 is an elevation of a slightly modified form of the support.

Fig. 9 is a vertical section of the support forming part of the deviceshown in Fig. 8.

Fig. 10 is an elevation of a further modilication.

Fig. 11 is a fragmentary plan of the device o Fig. 10.

During the performance of surgical operations it is very desirable thatan abundance of white light shall be directed upon or into the part orparts subjected to the operation and that this light shall emanate fromseparate sources to avoid the' formation of deep shadows. It is alsoimportant that the source of the light shall be positioned and arrangedto prevent annoyance to the operator or patient from glare of the lightor from heat radiating from the light sources and at the same time beadjustable to permit radiated heat from the source to strike the patientin case this is desirable. Certainty and ease of manipulation are .alsovery desirable in a device of this nature. The present invention is sodesigned and the parts so combined that the above and other desirablecharacteristics are secured, producing an illuminating unit which hasproved eminently successful for surgical and like operations.

As shown in Fig. 1 of the drawings, an upright hollow support orpedestal 10 is provided With a low laterally extending baseA 11, whichis supported on casters 12 to permit ease of movement of theilluminating unit to any desired position in the operating room. T esupport 11 carries van underhung socket 13 to which the pedestal 10 issecured sothat the weight of the device is kept low as possible to'prevent any danger of overturning. Within the pedestal 10 is slidablymounted a standard 14, which extends upwardly through an opening in theap at the top of the pedestal. The cap 15 is rotatably supported on thepedestal 10 and is provided with a rod 15 threaded through the flange ofthe cap and extending' through a horizontal slot in the upper end of thepedestal. The inner end of the rod 15 carries a .shoe15 foi` engagingthe standard 14 and locking the standard and cap against relativemovement. When so locked the attendant may use the rod 15 as a handlefor rotating the standard and parts carried thereby. Within the pedestal10 is a counterweight 16, having a central opening of suflicient size topermit the lower end of the standard 14 to project downwardly into orthrough the counterweight. The counterweight 16 is provided with pulleys17 through which a cable 18 is threaded. The cable 18 has its two endssecured to the cap 15, and the middle portion of the cable passesthrough an opening in the standard 14 and over a sheave 19 journaled inthe opening. This arrangement gives a two-to-one movement of thestandard 14 relative to thecounterweight 16, and when the standard is inlits uppermost position, which is the usual operating position, thecounterweight 16 will rest on the bottom of the underhung socket 13,thus bringing the weight very near to the floor and providing greaterstability for the supporting frame. The couuterweight 16 is free torotate in the pedestal 10 when the standard 14 and cap 15 are rotated bv the handle 15". In cases where less height of adjustment of thestandard 14 is sufficient the standard and counterweight may beconnected for one to one relative movement. Where this ar'- rangement isfollowed the sizeof the councollar 28 to hold the pinion 27 in fitting20 at the opposite side to the gearv fitting 20.

terweight can be correspondingly reduced. The standard 14 may be made ofmetal piping or other suitable materiah and is provided with a fitting20 at its upper end, through which a horizontal arm 21 extends and inwhich it is slidably supported. projecting portion 22 of the arm 21carries a weight 23for counterbalancing the illuminating unit carried bythe arm 21. The arm 21 is held in adjusted positions inthe fitting 20 byset screws or other suitable means. Slidably mounted in the arm 21 is arod or bar 24 having bifurcations 25 at its outer part on which ispivotally mounted the illuminating unit 26. The bar is provided with abevel pinion 27 having an integral collar 28 provided with a set-screw29, by which the pinion may be adustably fixed to the bar 24. A bracket3() is secured to the end of the arm 21 and engages the positionadjacent the end of the arm 21. The bar 24 may be adjustedlongitudinally in the arm 21 by loosening the set-screw 29 and slidingthe bar through the collar 28. Journaled on the bracket 30 in positionto mesh with the pinion 27 is a bevel gear 31 lhaving an arml 32 securedthereto and extending upwardly. therefrom. An extensible rod or pipe 33connects the upper end of the arm 32 with an. arm 34 carried by thepinion journaled on a stud shaft supported by the A worm 36 meshes withthe pinion 35 and is provided with a downwardly extending operatingshaft 37 journaled 4in a bracket 38 on the standard 14. The lower end ofthe shaft 37 is provided with a hand wheel39, by which it may beconveniently rotated by the operator. Rotation of the hand wheel 39 willbe transmitted through the mechanism described, to the collar 28 and therod 24, which in turn will shift the forks 25 and tilt the illuminat-jing unit 26 about a horizontal axis to direct the rays from the unit aswill hereinafter appear.

The worm. 36 will lock the illuminating unit in any position in which itis tilted by the hand wheel 39.

The upper end of the illuminating unit 26 is provided with a bracket 40,to which 1s pivotally secured an extension rod or pipe 41 having theopposite end thereof pivotally connected to an arm 42 projectingupwardly from the gear 43 mounted on the 35. A worm 44 meshes with thegear 43 and is provided with an operating rod 45 similar to the rod 37.A hand wheel 46 is connected with the rod 45 and preferably ispositioned below the hand wheel 39 to prevent confusion of the operatorin manipulatingthe two hand wheels. Rotation of the hand wheel 46 w1l1tilt the unit 26 about its pivotal connection with the .forks 25 and v53clamps Vthe lamp filament 62.

upon an axis at right angles to the tilting movement produced byrotation of the hand wheel 39. The illuminating unit will be held in itsvarious 4adjusted positions by the worm 44. A set-screw 47 is providedto per- A mit extension of the rod 41 to conform to various `positionsof the rod 24 in the arm 21. The rod 24 can be extended to bring theilluminating unit to the center of various sizedrooins and when this -isdone the arm 21 canbe adjusted in the fitting 20 to maintain a perfectbalance of the device. It should be noted that the hand wheels 39. and

46 are suliciently removed from the illum1' nating unit to permit theiroperation by persons outside of the immediate vicinity of the operatingtable. This permits the manipulation of the light by an attendantwithout danger of bringing infection to the patient or to those direztlyoccupied in the operation.

The construction of the illuminating unitwill be best understood fromFigs. 4 to 7 inclusive. This unit comprises a hollow cylindrical housing48 having a cover 49. The bracket 40 is provided with a rod 50, whichextends through the cover 49 and carries a fastener 51 by which the rodmay be adjustably secured to the wall of the housing 48. A set-screw v52projects through a-slot in the wall of the housing for clamping thefastener 51 in adjusted positions. The rod 50 is bent laterally near itscenter and provided with -a strap 53 to form a circular eye forreceiving alamp. socket 54. This vsocket passes of the housing 48 andcarries a slide 56 for closing the slot 55, the slide 56 being held byguide members 57 Figs. 4 and 6. The strap the lamp socket 54sufliciently tight to hold the socket in various positions to which itmay be moved either in the direction of the axis of the socket or indifferent angular positions of rotation. The vertical position of thelamp inthe housing 48 may be adjusted by loosening the setscrew 52 andmoving the vrod 50 vertically relative to the housing. An arm 58 isadjustably secured to the rod by a set-screw 59, and slidably mounted onthe arm 58 is a bracket 60 which carries a reflector 61 fur directingthe rays of light downwardly from be adjusted along the rod 58 and held1n its various positions by a set-screw 62 and it may also be adjustedto various A from the filament 62 by movement of the set-screw 59. Thereflector 61 comprises a plano-convex lens having its convex surfacesilvered as shown at 63. A concavo convex, parabolic, or other shape oflens may of course be used in a similar way for forming a refiectorwhere such other shape of reflec-I tor is desired. The lens is supportedin a socket member 64, carried by the bracket The reector 61 may.

distances through a slot 55 in the wall 60 so that the concave side ofthe silver coating is adjacent the filament 62, thus providing a concavereflector for the lamp. The rays of light emanating downwardly from thefilament 62 pass through the planoconvex lens 65,` which brings the raysin substantial parallelism and directs them downwardly in a cylindricalbeam.' A conical shaped member 66 is detachably secured to the lower'end of the casing 48 by bayonet sockets 67, Fig. 5, by which the size ofthe beam or field ofv light may be readily varied or controlled.

On a level with the lamp filament the housing 48 is provided with aplurality of laterally extending tubes 69. These tubes may vary innumber and are arranged in diametrically opposite pairs as shown in Fig.4. It will be noted that the tubes are all positioned on substantiallytwo opposite sides of the housing, leaving the other two sides of thehousing closed. This is for the purpose of preventing rays from beingemitted from the sides ofthe housing, which are ordinarily above thesides of the operating table where the attendants stand. By having allof the rays in substantially the plane of the table, and none comingfrom the sides thereof, there is less danger of shadows being formedwhich would obstruct the vision of the surgeon. The tubes are providedwith telescoping lens carriers 70, which are locked in adjustedpositions by i set-screw 71 and one of which is shown in section in Fig.7. Each carrier is pro-` vided with a lens 72 of plano-convex form andalso with a filtering screen 73 supported on spring clips'74. Thefilteringv screen 73 may be made of glass of a suitably selected colorto filter out any undesirable rays from the lamp- 62. With a nitrogenglobe a suitably selected blue colored screen will give a substantiallywhite light. The lenses 72 will deflect the rays so as to produce beamswhich are directed from the lenses 72 against a series of reflectingmirrors 75, adj ustably supported on arms 76 carried by the housing 48.A mirror is provided for each tube 69 and may be held in any adjustedposition by a set-screw 77 for reflecting the beam of light from itstube in the desired direction. By setting the various mirrors 75 so thatall of the beams from the tubes 69 will meet the beam from the casing 48at a common location a flood of light may be secured at any desiredposition so that the locality where the beams meet will be illuminatedby rays from a number of different directions, thus providing anabundance of light and the absence of deep shadows. The size of theYbeams from the mirrors may be adjusted by shifting the lenses 72 sothat all beams falling on the common field will be of substantiallyuniform size. This adjustment of the lenses together with the removablemember 66 permits adjustment of the size of the illuminated field asoccasion may require. Itshould be noted that the field in which thebeams meet is below the locality into which region of best 'illuminationinto the desired -position for properly illuminating the area for thevarious operations. It will be seen that the light may be readily raisedor lowered by pushing up or down on any of the parts connected with thestandard 14 and that it may be tilted to any desired angle and held inthese positions by rotating the hand wheels 39 and 46. Thesemanipulations may be made by an attendant at a distance from theoperating table without danger of contamination, the practicallyuniversal adjustment of the light secured permitting completeillumination in thev proper position for practically any operation thatthe surgeon may wish to perform. The overlapping of the beams from thevarious directions will intermingle the rays so that any tendency tochromatic separation or the colors will be overcome by the overlappingof' the beams from the various projectors.

In order to intercept falling dust Tor other foreign matter a glassshield 78 may be suspended beneath the illuminating unit by rods 79supported by the bars 76. It will be noted that the opposite position ofthe tubes 69 will bring the lenses 72 diametrically opposite one anotherso that any rays reflected from their inner surfaces will be re-directedbackwardly through the housing and unite with the rays emanating fromthe original source of light. This will effect a considerable saving inlight for the reason that approximately ten per cent ofthe light whichstrikes a lens is reflected from the surface and not transmitted.

In some operating roomsv it is not convenient to provide space for astandard and counterbalance like that shown in Fig. 3. In places of thiskind anarrangement similar to that shown in Fig. 8 may be employed. Inthat figure a pedestal 8O is provided with supporting rollers 81 and anupwardly projecting frame 82 having rollers 83 arranged to travel in atrack 84 secured to the wall. This will permit the standard to belocated adjacent the wall of the building and to be. moved along theroom parallel with the wall.

.housing 48 and a globe roughened or other In place of the standard 14 acurved rod or bar 85 may be provided, having its vertical portion 86arranged to slide up and down in the pedestal 80 and having a horizontalarm 87 for supporting the illuminating unit in a manner similar to thearm 2l in the forni of the device previously described. A cable 88passes over a pulley 89 on the frame `824 and a pulley 90 on thecounterweight 91. The end of the cable is then attached to the cap 92for the pedestal 80. This will permit vertical movement of the arm 87under control. of the counterweight 91, there being a relativetWo-to-one movement of the arm and counterweight. The outer end of thearm 87 is supported by a cable 93 passing over a pulley 94 on the frame82 and having its lower end secured directly at 95 to the counterweight91. The tact that the cable 93 extends at an angle from the frame 82retains the cable '93 substantially taut for a limited movement of thearm 87 With a direct connection of the cable to the weight 91, althoughthe vertical movement of the arm is twice that of the Weight. Gearwheels 96 and hand Wheels 97 are provided for tilting the illuminatingunit in the manner previously desc-ribed. y

Where the invention is used in a room .having no other source of generalillumination it may be desirable to provide an additional light globe asshown in Figs. 10 and 11. For this purpose a socket 98 having a bulb 99is secured to the top of the 100 encases the bulb. The globe may be madeof glass having a suitable surface for diffusing the light.A The socket98 is preferably on a separate circuit 101 so that in case of accidentto the light circuit for the main unit the light of the bulb 99 will notbe affected. If the main unit should fail the casing 48 can be invertedso that the Ibulb 99 will supply sufliced light to enable the surgeon tocare'for the patient until the difticulty 1s remedied. -This additionalsource 'of light is also shown in Figure 1 as applied to the form ofdevice illustrated in that tigure. The unit illustrated in Figure 1, asWell as that of Figures 1() and 11, may be readily inverted by rotatingthe bar 24 in the arm 21, the arm or bearing. It will be understood, ofcourse,

. that in the device sho-Wn in Figure 8, the arm 87 serves as the axisfor rotative movement of the bar 24. The two circuits are con-` trolledseparately by a vswitch or switches in reach of the attendant. The rod41' by which the housing 48 is tilted is in this case bent laterally andconnected to the sideof the casing 48 by a bolt 102.

I claim:

1. In a device of the class described., an illuminating vunit and asupport for said unit including a pedestal, a standard verti- 'thepedestal for 21 serving as an axis cally movable in the pedestal, ahorizontal arm upon which the unit is mounted extending from saidstandard, the illuminating unit being positioned substantially over thefield to be illuminated, and means at rotating the standard and therebymoving the unit bodily in a curvilinear path about the pedestal as anaxis, said means having a member adapted to lock the standard againstvertical movement.

2. In a' device of the class described, an illaminating unit. and asupport for said unit including a pedestal, a horizontal armupon whichthe .unit is mounted extending from said pedestal, the illuminating unitbeing positioned substantially above the field to be illuminated,manually operable means at the pedestal for bodily moving the entireunit, said means being adapted to lock the device in its variouspositions of adjustment, and manually and independently operable meansat the pedestal for tilting the' unit about a plurality of angularly.related axes.

3. r1`he combination with an illuminating unit, of a horizontal arm forsupporting said unit substantially over a ield to be illaminated, and apedestal support for said arm comprising means for bodily adjusting thearm vertically to various heights above said lield and adapted to lockthe arm in any selected position of adjustment, and a counter-balancingweight on the opposite side of said pedestal support from the unit forretaining the arm in substantially horizontal position and balancingsaid support.

4. The combination with an illuminating unit, of a horizontallyextending arm for supporting the unit substantially above the field tobe illuminated, a support for said arm, means for vertically adjustingthe arm on said support, the illuminating unit being adjustablelongitudinally of the army to- Ward and from the support and a counterbalancing Weight on the arm on the opposite side of the support from theunit and adjustable toward and from the support in aecordance withtheadjustment of the unit longitudinally ot the arm.

5. The combination with an illuminating unit, of a. horizontallyextending arm for supporting the unit substantially above the field tobe illuminated, a supporting pedestal for said arm, means for verticallyadjusting the arm on said support, the illuminating unit beingadjustable longitudinally of the arm toward and from the supwith anilluminating of a support therefor comprisingl a pedestal, a base forsaid pedestal, an

underhung socket on said base into which the pedestal opens, avertically adjustable standard in said'pedestal, a counterweight for thestandard operatively connected to the same and arranged to rest in saidunderhung socket when the standard is raised,

, thereby balancing the pedestal.

7. The combination with an illuminating device, of a support thereforcomprising a horizontally extending arm, means for counterbalancing saidarm to retain said arm in its horizontal position, a standard forsupporting said arm, a hollovs7 pedestal in which said standard isvertically .movable, a counter-balancing weight located within saidstandard, mot-.ion multiplying mechanism connecting said weight andstandard, means positioned adjacent said standard for tilting saiddevice upon its support to various positions of adjustment, and one-waymotion transmitting mechanism for locking said device in its variouspositions of adjustment.

8.'In a device of the class described, an illuminating unit and asupport for said unit adapted to position the same substantially overthe field to be illuminated including a hollow pedestal, a standardvertically movable in said pedestal, a counter- Weight for the standardwithin the pedestal, means for connecting the standard to thecounterweight, a horizontal arm carried by the standard and upon whichthe illuminating unit is adjustably mounted, and manually operable meansat the pedestal for tilting the unit and for retaining the latter inadjusted position.

9. In a device of the class described, an illuminating unit and asupport for said unit adapted to position the same substantially overthe field to be illuminated including a hollow pedestal, a standardvertically movable in said pedestal, a counterweight for the standardwithin the pedestal, means for connecting the standard to thecounterweight, said counterweight being hollow and receiving thestandard, a horizontal arm carried by the standard and upon which theilluminating unit is adjustably mounted, and means at the pedestal fortilting the unit upon the arm and for retaining the latter in adjustedposition.

10. In a device of the class described, an'

illuminating unit and a support for said unit adapted to positionthesame substantially over the field to be illuminated including ahollow pedestal, a standard vertically movable in said pedestal, acounterweight for the standard within the pedestal, means for connectingthe standard to the counterweight, a horizontal arm carried by thestandard and upon which theilluminating unit is adjustably mounted,`means at the pedestal for tilting the unit in retainingthe latter inadjusted position, and means on the pedestal for rotating the standard,said last mentioned means serving also to lock the standard @againstvertical movement.

11. A device of the class described comprising an illuminating unitincluding a casing, a source of light within the casing, at least twoindependent lenses positioned on two substantially opposite sides ofsaid source in the paths of' the light and-arranged to project aplurality of beams in opposite directions horizontally through thecasing, the other two sides of the casing in the same horizontal planebeing closed to prevent the emission of rays therefrom means adjacentthe casing for bending and reflecting the beams projected by said lensesupon a common field, and a support for said unit adapted to position thesame substantially above said field.

12. A device of the class described comprising an illuminating unitincluding a casing, a source of light within the casing, a plurality ofadjacent apertures in said casing in each of two substantially oppositesides of the same, the other two sides of the casing in the samehorizontal plane being closed. to prevent the emission of raystherefrom, lenses positioned over said openings, means for bending andreflecting the beams projected lby said lenses upon a common field, anda support for said unit adapted to position the samesubstantially-.above said field.

1 3. An illuminating device of the class described comprising anilluminating unit having a casing, a source of light within 'saidcasing, means for projecting a pluralcommon field, means for supportingsaid illuminating devices substantially above and over a table to beilluminated, means for vertically adjusting said devices to c'ontrol thetemperature effect of said device upon the illuminated field of thesurrounding region, said adjusting means being positioned a substantialdistance horizont-ally from said field, and means for focusing saidbeams.

14:. An illuminating device of the class described comprising a casing,a source of light within said casing, a plurality of lateral openings insaid casing whereby beams are projected laterally from said source oflight through said openings, means for bending and reflecting said beamsfrom separated sources upon a common field, and

, arated sources upon a 15. An illuminating device of the classdescribed comprising a casing, a sourceof light Within said casing, aplurality of lateral openings in said casing whereby beams are projectedlaterally from said source of light through said openings, means orbending and reflecting said beams from sepcommon field, a support forsaid device adapted to support the same substantially above and over thefield to be illuminated, and an imperforate glass late interposedbetween the said device and the field to in tercept particles of foreignmatter that might fallinto the illuminated ield. i y

' 16. An illuminating unit comprising a casing, an initial source oflight within said casing, means for projecting'a plurality of beams fromsaid source in substantially opposite directions, means for bend- -ingand directing said beams from separated points upon a common field, anda separate source of light from the exterior of said casing adapted toprovide general illumination.

17. An illuminating unit comprising a casing, a source of light withinsaid casing, means for projecting a plurality of' beams from said sourcein substantially opposite directions, means for bending and directingsaid beams from separated sources upon a common field, and a separatesource ot light upon the exterior of said casing adapted to providegeneral illumination, said means being adapted to receive current from acircuitseparate and distinct from the circuit of the source of lightWithin said casing.

18. An illuminating unit comprising `a casing, a source of light Withinsaid casing, means for projecting a plurality of beams from said sourcein substantially opposite directions, means for bending and directingsaid beams from separated sources upon a common field, a separate sourceof light upon the exterior of said casing adapted to provide generalillumination, and' means for -bringing said source of generalillumination in position to illuminate the area subjected to specialillumination by said beams.

19. In combination an.illuminating unit having means therein forprojecting a beam of light, a source of general illumination carried onsaid housing opposite said' beam, and means for inverting said housingto bring the source of general illumination into position to illuminatethe area subjected to special illumination by the projected beam.

. 20. In combination an illuminating unit having a source of light andmeans for pro- 'ecting a beam from said lsource on an area to besubjected to special illumination, a separate source of generalillumination, separate means for controlling the supply of energy tosaid sources, and means for moving said unit to direct lightfrom'thesource of generalillumination upon the field for special illumination.

21. In a deviceof the class described and in combination, anilluminating unit comprising a casing, a source of light within saidcasing, lateral openings in said casing permitting the transmission ofseparate beams from said source of light, means ior bending anddirecting said beams on to a common field; and a support for said unitcomprising a substantially horizontal arm, a verticaly standard Jforsaid arm, means for bodily adjusting said unit rectilinearly toward andfrom the standard and in a curvilinear path about the standard, saidadjusting means being spaced a substantial distance horizontally fromsaid illuminated field, yand additional means adjacent the standard fortilting said illuminating unit upon said arm.

22. In a device of the class described and in combination, anilluminating unit comprising a casing, a source of light Within saidcasing, lateral openings in said casinfr permitting the transmission ofseparate earns from said source of light, means for bending anddirecting said beams on to a common field; and a support for said unitcomprising a substantially horizontal arm, a vertical standard for saidarm, means for bodily adjusting said unit rectilinearly toward and fromthe standard and about the standard, said adjusting means being spaced asubstantial distance horizontally from said illuminated field, andadditional means adjacent the standard for tilting said illuminatingunit about a plurality of axes upon said arm, one of said axes beinghorizontal.

'23. In a device of the class described and in combination,anilluminating unitcomprising a casing, a source of light within saidcasing, lateral openings in said casing permitting the transmission ofseparate beams from said source of light, means for bending anddirecting said beams on to a common field; and a support for said unitcomprising a substantially horizontal arm, a vertical standard for saidarm, means for bodily adjusting said unit rectilinearly to- Ward andfrom the standard and in a curvilinear path about thestandard, saidadjusting means being spaced a substantial distance horizontally fromsaid illuminated field, and additional means for' tilting saidilluminated unit about a plurality oi horizontal axes upon said arm.

24. In a device of the class described and in combination, anilluminating unit comprising a source of light, means for projecting aplurality of beams substantially radially and in a horizontal plane fromsaid source, means for bending and directing said beams from separatedpoints on to a common in a curvilinear path.

field and a support for said unit comprising a substantially horizontalarm, a standard for said arms, and manually engageable means adjacentthe standard for tilting said unit about an axis of said arm, and abouta horizontal axis at an angle to said rst mentioned axis.

25. In a device of the class described and in combination, anilluminating unit comprising a source of light, means for projecting aplurality of beams substantially radially and in a horizontal plane fromsaid source, means for bending and directing said beams from separatedpoints on to a common field; and a support for said unit comprising asubstantially horizontal arm, a vertically adjustable standard for saidarm, and manually engageable devices adjacent the standard for tiltingsaid unit about an axis which substantially coincides with the axis ofsaid arm, and about a horizontal axis at an angle to said firstmentioned axis.

In testimony whereof I have signed by name to this specification on this23rd day of November,'A. D. 1921.

PATRICK A. NIRDLINGER

